Method and apparatus for bottoming bags



May 31, 1932. A. E. CURRIER 1,860,386

METHOD AND APPARATUS FOR BOTTOMING BAGS Filed Aug. 28, 1950 s Sheets-Sheet 1 Fig. 1

gwuml oa May 31, 1932.

A. E. CU RRIER METHOD AND APPARATUS FOR BOTTOMING BAGS 5 Sheets-Sheet 2 Filed Aug. 28, 1930 y 31, 1932 A. E. CURRIER 1,860,386

METHOD AND APPARATUS FOR BOTTOMING BAGS Filed Aug. 28, 1930' 5 Sheets-Sheet s Qwuqntoo y 31, 1932- A. E. CURRIER 1,860,386

METHOD AND APPARATUS FOR BOTTOMING BAGS Filed Aug. 28, 1950 5 Sheets-Sheefi 4 y 19-32. A. E. CURRIER 1,860,386

METHOD AND APPARATUS FOR BOTTOMING BAGS V Filed Aug. 28, 1930 5 Sheets-Shee 5 Fig.1

Patented May 31, 1932 UNITED STATES PATENT OFFICE ANDREW ELLISON GURRIER, 01' LEOMINSTER, MASSACHUSETTS, ASSIO'NOR TO CORNELL BAG CORPORATION, OF NEW YORK, N. Y-, A CORPORATION OF DELAWARE METHOD ANIO APPARATUS FOR BOTTOMING Application filed August 28, 1980. Serial- 110.4583.

This invention relates to a method and apparatus for bottoming bags, and has for its object a method by which a bag formed of a plurality of plies of paper may have the plies of one of the flaps divided so that part of the plies are beneath the flap which is folded in from the other side of the bag, and one or more of the plies is outside'of the flap folded in from the other side of the bag.

Details and minor objects of the invention will appear as the description proceeds.

In the accompanying drawings forming a part of this specification, Figure 1 is a partially diagrammatic side elevation of the apparatus by which the invention can be carried out. Fig. 2 is a section along the line 22 of Fig. 1. Fig. 3 is aside elevation of a portion of the apparatus viewed from the opposite side from which Fig. 1 is taken.

Fig. 4 is a detail view of a part of the folding foot. Fig. 5 is a detail view of a pressure foot. Fig. 6 is an enlarged detail of part of the apparatus viewedfrom the same slde as Figure 3. Fig. 7 is an'enlarged detail of part of the apparatus viewed from the same side as Fig. 1. Figures 8 to 11 are views of successive positions of the folding foot. Figures 12 to 18 are views showing successive operations upon the bag.

In the device illustrated, the various parts are mounted upon a suitable frame 20. The apparatus is driven by power which may be applied to a wheel 21 and connected to the various rollers and working parts by obvious means. generally removed for purpose of clearer illustration.

The bags enter-at the right end of the view, as viewed in Fig. 1, between opening rollers 22 and 23 following roller 23 around underneath roller 24 and passing over roller 25 and beneath pasting roller 26. Paste is applied in a desired pattern, as will be described later, by suitable pads on roller 26 which are coated by a transfer roller 27 taking adhesive from roll 28 running in a suitable receptacle After the paste has been applied the bag continues between rollers 30 and 31. which crease the end of the bag to define flaps, in

a well known manner.v Up to this pointthe ers 30 and 31. It willbe seen that the upper flap 33 has been folded backward while the forward flap 34 remains in its ori 'nal position and end fla s 35 have been dlded in over the ends of aps 33 and 34. Paste 36 has been applied to flaps 34 and35 as indicated in Fig. 12. As the bag passes between creasing rollers 30 and 31, creases 37, as shown in Fig. 13, are formed in a well known manner. After this operation, the bag is moved underneath and encounters a folding device, which will be described later in detail. By this folding device the following flap 33 is bent upward and forward along line 37 to the position shown in Fig. 14. This flap 33 is formed of a plurality of plies. After it has been folded to the position in which it is shown in Fig. 14, the folding foot and suitable pressure foot remain in frictional contact with the outer ply of the flap and prevent its forward movement, while the bag continues to move forward. This results in moving the outer ply 38 of the flap 33 rearward relative to the inner plies, as shown in Fig. 15. Preferably the customary cuts,

shown at 39 are not as deep as the flaps beyond line 3 so that when outer ply 38 is pulled back in the manner described it is torn along irregular lines 40 extending'from the ends of cuts 39, as shown in Fig. 15. After the outer ply has been thus separated from the inner plies, it is lifted and folded backward, as indicated in Fi 16, whereupon the leading flap 34 is fol ed back over the irner plies 41 of flap 33, as indicated in Fig. 1

After passing through compression rollers the end of-the bag is again passed throu h pasting rollers which apply paste, as in icated at 42 in Fig. 17 Thereafter the outer ply 38 is folded down in the usual manner upon flap 34 and rests in that position.

The. modified folding foot, by means of which the following flap 33 is first folded upward and then the outer ply se arated from the inner plies is illustrated in igs. 2 to 7 1n,- clusive. Standards 50 projecting upward from frame 20 carry a rock shaft 51. Th1s rock shaft has an arm 52 connected by an arm 53 to a cam 54 on the end of the shaft carrying roller 30. In this way the desired rocking movements are given to shaft 51 in timed relation with the operation of the rest of the machine. Mounted upon the shaft 51 between standards 50 there is an arm 55. This arm is mounted for limited movement upon the shaft. A collar 56 fixed upon the shaft carries a lug which limits the movement of the arm to the left, as viewed in Fig. 1. The arm is normally held against this abut ment by springs. There is shown for this purpose a torsion spring 57 and also a tension spring 58 which isconnected to an arm 59 projecting forward from arm 55. The roller end of arm carries a lever 60 which in turn has a friction roller 61 at its right end as viewed in Figs. 8 to 11 and has pivoted to its left end at 62 a foot 63. Foot 63 carries a roller '64 which operates in a cam track in a plate 65. A spring 66 connects the foot with arm 55 and normally lifts roller 64 as far as the cam track permits.

Roller 61 rides back and forth against surface 67 on cam plate as the carrying arm is oscillated. Roller 64, as the arm moves to the left from the position as shown in Fig. 8, runsdown a cam track 68 and against tongue 69, which is pivotally mounted at 70 and is normally held by a spring 71 in the position in which it is shown in the drawings. There-v after, the roller continues to roll along cam track 72 until it reaches the end 73 thereof,

. whereupon the roller is flipped upward by spring 66 against cam track 74. As the arm swings back to the right, roller '64 follows cam track 74 back to cam track 68, depressing and rolling past tongue 69 as it moves to cam track ,68.

It will be readily seen that by proper shaping of the cams, the toe portion 75 of foot 63 is first moved beneath flap 33, as indicated in Fig. 9 and then moves the flap forward to the position in which it is shown in Fig. 10,'after which it is pressed downward somewhat and then gradually raises until it is flipped upward at the end of.the forward move.

The foot 63 comprises a plate 76 which isnearly of the length of flap 33, as will clearthe end of a lever 84 mounted at 85 upon a stationary bracket 86. Lever 84 carries a roller 87 held in contact with cam 88 on shaft 89 of corresponding roller 31. In the drawings, tension spring 90 is indicated as connected to link 83 and standard 50 in order to maintain the contact of roller 87 with cam 88. By this means, valves 81 are used to connect channel 77 with the source of action at proper intervals and with the air when vacuum is to be broken. It will be understood that the vacuum is applied when the foot has been placed in position, as shown in'Fig. 10, and is continued through the position in which it is shown in Fig. 11, in order to prevent relative movement between the foot and outer ply 38. As the foot approaches its left position, its movement is slowed up sufiiciently to draw back the outer ply 38 to the posit-ion in which it is shown in Fig. 15 before the foot is raised. The vacuum is continued until the foot. is raised, thereby raising outer ply 38 and folding it back to position in which it is shown in Fig. 16, after which the vacuum is broken in order to release the ply from-the foot.

In order to insure the tearing of the outer ply along the lines 40 approximately where desired, it is preferable to employ pressure feet which contact the end flaps just beyond the ends of flap 33. For this purpose there are arms 91 mounted upon a rock shaft 92 carrying adjustable pressure feet 93., Fixed upon rock shaft 92 there are brackets 94 carrying stop pins 95 against which arms 91 are normally held by tension springs 96. This allows yielding of arms 91 as indicated in dotted lines in Fig. 5. Rock shaft 92 also can ries an arm 97, as indicated in Fig. 7 to which there is pivoted a link 98 which carries a roller 99 working against a cam 100 on the shaft 101 of a pasting roller 102 dc scribed-below. An arm 103, fixed on rock shaft 92-is connected by tension spring 104 to the frame of the machine 20 and holds roller 99 in contact with cam 100. The timing of the apparatus in the shaft of cam 100 is such that feet 93 oscillate forward with the movement of the bag end to the bag and press the end flap downward just beyond the cuts 39 and tear lines 40 at the time when the tear is being made, as described above.

As the ply 38 of flap 33 is bent backward to the position in which it is shown in Fig. 16, flap 34 encounters main switch which bends it backward around line 37 and the flap is rolled downward by passing through pressure rollers 105. This operation is in accordance with the usual folding backward of the forward flap, as previously shown. After the bag has passed through pressure rollers 105, it runs over roller 106 and beneath pasting roller 102, which is similar to pasting roller 26, and applies paste as shown at 42 in Fig.,17. Pasting roller 102 is provided similar to rollers 27 and 28 in receptacle 29. Thereafter ply 38 is folded forward to the position in which it is shown in Fig. 18, by a folding foot 110 operated in a well-known manner and the bag end is then rolled down by pressure rollers 111.

The method and apparatus described above is intended for manufacturing a bag substantially like that disclosed in a co-pending application of Arthur L. Currier for multiwall bags, Ser. No. 284,236,fi1ed June 9, 1928,

issued January 20, 1931 as Patent 1,789,807. By the method disclosed it is possible to fold the flaps in substantially the well-known manner, except that the outer ply of the inner flap is separated from the inner plies of that flap so that it can be folded over outside of ,the opposed flap. By this method disclosed this outer ply is positively separated from the inner plies while the corners of all the plies are folded down and thereby the corners of the outer ply are torn to some extent, but the separation of this ply from the inner plies is insured.

It will be readily understood that various changes may be made in the construction and arrangement of the various parts within the scope of the appended claims.

What I claim is:

1. The method of closing the end of a multiply bag, which consists in spreading apart the ends of two sides of the bag and thereby forming opposed multi-ply flaps, folding over all of the plies of one of said flaps into bagclosing position, holding the flap in said position while forcing the outer ply to move in the plane thereof, relatively to the other plies,

' away from the edge of the flap, thereafter raising said outer ply above the inner plies, folding the opposed flap over said inner plies and under said outer ply, and folding down Eaid outer ply onto the outside of said opposed fi The method of closing the end of a multiply bag, which consists in spreading apart the ends of two sides and thereby forming opposed multi-ply flaps, folding over all of the plies of one of said flaps into bag-closing position and in a line resulting in diagonal folds at the two ends of said flap, thereafter forcing the outer ply of said flap to move relatively to the inner plies, in the plane thereof and away from the edge of the flap, while holding down the diagonally folded corners of said outer ply so as to tear the ply on lines substantially normal to the edge of the flap, thereafter raising said outer ply from said inner plies, folding the opposed flap over said inner plies and under said outer ply, and folding down the outer ply against the outside of said opposed flap.

3. Apparatus for bottoming multi-ply bags,

comprising means to s read apart the ends of two sides of a bag an form 6 posed multiply flaps, means to fold all 0 the plies of one of said flaps into bag-closing position, means to thereafter separate the outer ply of the folded flap from the inner plies thereof,

means to fold the opposed flap outside of said inner plies and inside of said outer ply, and means to fold said outer ply outside of said opposed flap.

4. Apparatus for bottoming multi-ply bags, comprising means to spread apart the ends of two sides of a bag and form opposed multiply flaps, ;means to fold all of the plies of one of said flaps into bag-closing position, means fol thereafter moving the outer ply of the folded flap in the plane thereof, relatively to the other flaps, away from the edge of the flap and to thereafter raise said outer ply away from the inner plies, means to fold the opposed flap outside of said inner plies and inside of said outer ply, and means to gold said outer ply outside of said opposed ap. 5. bags, comprising means to spread apart the ends of two sides of a bag and form' opposed multi-ply flaps, means to fold all of the plies of one of said flaps into bag-closing position, means for thereafter moving the outer ply of the folded flap in the plane thereof, relatively to the other flaps, away from the edge of the flap and to thereafter raise said outer ply away from the inner plies, means for holding down the ends of the first folded flap during said movement of the outer ply in its plane, so as to tear said outer ply along desired lines as its corners, means to fold the opposed flap outside of said inner plies cornerslthereof, and thereby separating the outer ply from the inner plies.

7. Apparatus "in accordance with'claim 3' and in which the means for separating the outer ply from the inner plies of one of the flaps comprises a plate adapted to cover a large portion of the flap, said plate having a channel therein and being perforated from said channel to the face in contact with the ply, and being adapted for connection with a source of action.

8. Apparatus for bottoming multi-plyv bags, comprising means for folding a flap into closing position and separating the outer Apparatus for bottoming miilti-ply ply of said flap from the inner plies thereof, said means comprising a folding plate havin vacuum channels therein open1n throug the face of the plate contacting t e flap.

9. Apparatus in accordance with claim 8, in combination with means for holding down the corners-of the flap while said plate is being lifted from the main body of the flap. In testimony whereof I have hereunto signed m name to this s ecific'ation.

AN REW ELLI ON OURRIER. 

